science for a changing world Prepared in cooperation with the NOV. 0.42003 IOWA DEPARTMENT OF TRANSPORTATION and the IOWA HIGHWAY RESEARCH BOARD (Project HR-456) Main-Channel Slopes of Selected Streams in Iowa for Estimation of Flood-Frequency Discharges Water-Resources Investigations Report 03-4120 50 75 100^ 125 150 175 200 DISTANCE UPSTREAM FROM MOUTH OF RACCOON RIVER, IN MILES U.S. Department of the Interior U.S. Geological Survey uses NOV 0 4 2003 science for a changing world ERRATA SHEET WATER-RESOURCES INVESTIGATIONS REPORT 03-4120 By David A. Eash The figures included on these pages replace figures 19, 23, 38, 40, 78, 88, and 142, which were printed in the original report with inaccuracies that were introduced during the printing process. 5.0 Curve adjusted 14.8 percent; see section 4.8 "Adjustment of Curves" for explanation 4.6 4.4 4.2 4.0 3.8 3.6 3.4 3.2 3.0 345678 10 11 DISTANCE UPSTREAM FROM MOUTH, IN MILES Figure 19. Buttrick Creek, beginning at mouth in Greene County. 8.0 Curve adjusted 17.7 percent; see section 7.5 "Adjustment of Curves" for explanation 6.0 5.0 , c CO 4-5 4.0 -A 3.5 3.0 2.5 2.0 10 15 20 25 30 35 40 45 50 55 60 DISTANCE UPSTREAM FROM WAYNE-LUCAS COUNTY LINE, IN MILES Figure 23. Chariton River, beginning i-Lucas County line. 16 Curve adjusted 17.7 percent; see section 15 "Adjustment of Curves" for explanation ^ 14 DC 13 LU Q. LU 12 LU UL O Z 6 8 10 12 14 16 18 20 22 24 26 28 30 32 34 36 DISTANCE UPSTREAM FROM MOUTH, IN MILES Figure 38. English Creek, beginning at mouth in Marion County. 23 ^ U "- ^ ^ - M > 1 M r I I I IM /_ 22 Cljrv ejidj us eC 1 4.8 P src er t; 56(5S ec tio n ^ s" / Adjus tm er tc fC^ur ve for e,<planat! on 21 ^ ^ 20 ^ ^ 19 v ^ 18 /-> ^7 17 / y1 ^_ 16 _j / rx 1b / > ^ 14 X__> x / 13 x ' ^ 12 ^^ ^ « *£. 11 *&. * **» * a ^M ^i« 0M 0 MM Hi « = ^ 10 MM § 1 a 9 34567 10 DISTANCE UPSTREAM FROM MOUTH, IN MILES Figure 40. Farm Creek, beginning at mouth in Mills County. 12.0 -f- r i = n 11.5 C ur V J£id ju st eci 4 .8 P ereer it; se< 2!56ct io n Adj US,trn«jnt<3f CurV(3S for(5XPiarlatic>n A C.. 11.0 JL 4 UJ f ^ 10.5 i, * * £ 10.0 * 0. * & uj 9.5 / UJ * UL 1 Z 9.0 r CL 8.5 ^ 2 ^ CO 8.0 ^ ^ UJ ^ ^ ^ < * t& O 7'° ^ 0 ^ ^ < 6.5 ^* ^ ^ ( » «*rf s « 6.0 =» ^ s M M 5.5 so 4 5 6 7 8 9 10 11 12 13 14 DISTANCE UPSTREAM FROM MOUTH, IN MILES Figure 78. Mud Creek, beginning at mouth in Scott County. 14.0 | | | | | | | | | | j | | | | || | i:":::i:i:::::^:i: = 135 ,,.. Curve adjusted 1 4.8 percent; see section _ _ _ . "Adjustment of (Curves" for explanation 13.0 - - I I I I I I I I I I I I I I Uj __________________ ;,_==:=::= -1 12.5 -------- ::::::::: ___________ -_______jC. _ _ _ _rf _ _ _ _ . gj 12.0 :-:-:::_:::::::::: . ___e_ ____. a, : :::-;___:: ::::: -------g» !*________. fc 11.5 :::::::::::::::::: u_UJ __________________. ______ _________ <-*-----: 2 11.0 I-:::::-::::::::-: ----------------» ::::::::i-5_*:::: £ 10.5 :n::::::::::::::: O : =:::: :::::::::: ;i=*:!E_EEEEEEEEE MAIN-CHANNELSI b01cneno _--_-_____________ w 5H p;-400-JCO 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 DISTANCE UPSTREAM FROM MOUTH, IN MILES Figure 88. Otter Creek, beginning at mouth in Buchanan County. 4.0 Curve adjusted 14.8 percent; see section 3.8 "Adjustment of Curves" for explanation LLJ 3.6 DC __ 3.4 UJ ui 3.2 . 3.0 O CO _1 UJ 2.8 z 2.6 O 1 2.4 2.2 2.0 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 DISTANCE UPSTREAM FROM MOUTH, IN MILES Figure 142. Winnebago River, beginning at mouth in Floyd County. USGS science for a changing world ERRATA SHEET WATER-RESOURCES INVESTIGATIONS REPORT 03-4120 By David A. Eash The figures included on these pages replace figures 19, 23, 38, 40, 78, 88, and 142, which were printed in the original report with inaccuracies that were introduced during the printing process. 5.0 Curve adjusted 14.8 percent; see section 4.8 !l Z "Adjustment of Cu rves" for explanation 4.6 cc LU Q. 4.2 a! 4.0 2 CO I 3.8 zyj X 3.6 O 3.4 3.2 3.0 345678 10 11 DISTANCE UPSTREAM FROM MOUTH, IN MILES Figure 19. Buttrick Creek, beginning at mouth in Greene County. 8.0 Curve adjusted 17.7 percent; see section 7.5 "Adjustment of Curves" for explanation 6.0 b55'5 5.0 7 co <* in <* o o co in co q c\iin 2.0 10 15 20 25 30 35 40 45 50 55 60 DISTANCE UPSTREAM FROM WAYNE-LUCAS COUNTY LINE, IN MILES Figure 23. Chariton River, beginning at Wayne-Lucas County line. ~r | Curve adjusted 17.7 percent; see section "Adjustment of Curves" for explanation ^ / o-sioocoo-^roco-p^oi ^ J ^ A f f SLOPE,INMILEMAIN-CHANNELPERFEET £ 7' f w / ^ / wt jj JP f m f ^ w ? J f j ^ »* ^ * * > m ^ i > > a 91 s a" » ^ P" I f - m mm m « « 10 12 14 16 18 20 22 24 26 28 30 32 34 36 DISTANCE UPSTREAM FROM MOUTH, IN MILES Figure 38. English Creek, beginning at mouth in Marion County. 23 1 1 1 h- 1 1 I I I1-1 1 Idjr - /- 22 OLJIVtic us ec 1 *.C P die en t; set 3Sec tio n .f. s" t Adjus,t!T eritc>fCXii ve foi e xplanati on 4 21 -4 f \ LLI -JL ^ 20 f .£. f,. uu 19 V-t OL _> _y r LU 18 ^c. LLJ LL ^_.^ ... J Z 17 V -J LLI t- A QL 16 Jt. O X' en -ic ^ ^ MAIN-CHANNEL co*>.orociCD-j. ^..^ ^ L^ 2_ -^ ^ ^ ^L. ^ ^! fi. Z2 ** ^ a * 1MB av M « is =5 aa ^B 34567 10 DISTANCE UPSTREAM FROM MOUTH, IN MILES Figure 40. Farm Creek, beginning at mouth in Mills County. 12.0 u U = U = U H H H = H - H ~ i 11.5 c jr VeMid ju st ec 4 .8 F ercer it; se< 3!36ct io n Adj\K.strnc5nt(jf Cur V 3S for(5Xplariatic>n r/ 11.0 / LLI 4 * -1 10.5 L * £. £ 10.0 f-^ Q- / ^ LTJ 9.5 * LU * LL X Z 9.0 x > . l' ^ a! 8.5 X O CO 8.0 ^ LU ^ ^ ^ *^ < ^ ^ O ^ ^ ^ < 6.5 ^i ** « s 6.0 m H * Mi ^ m e 5.5 fin 4 5 6 7 8 9 10 11 12 13 14 DISTANCE UPSTREAM FROM MOUTH, IN MILES Figure 78. Mud Creek, beginning at mouth in Scott County. ---EE~~~-~EE~-~EE~~- H-4-----^--^----^- 135" Curve adjusted 14.£5 percent; see section - - : "Adjustment of Curves" for explanation 13.0 - i i i i i i i i i i i i i i i i UJ ____________________ -1 12.5 :::::::::::::::::::: . _ _ Z - _ _ - . £ 12.0 : = :::::::: :::::::: ____-< Q. ____________________ LU 11.5 :::::-::::::--::::-: ________ _____gS__ LU ______ _____ _ _____ z 11.0 :::::::::::::::::::: o_ 10.5 -------------------- o EEEEEEEEEEEEEEEEEEEE co 10.0 :-::::::::::::-::::: _j _______":__ _______ 1 95 : Er:::rE :: EEE :=:::r: .t !*--________________- I 85 EEEEEEEEEEEE-=;:!:: 8.0 m----------------- 7.5 -------------------- 7 n ::::::_:::::_:_::::: 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 DISTANCE UPSTREAM FROM MOUTH, IN MILES Figure 88. Otter Creek, beginning at mouth in Buchanan County. 4.0 II11 Curve adjusted 14.8 percent; see section 3.8 ~~~~. "Adjustment of Curves" for explanation 3.6 3.4 3.2 3.0 2.8 2.6 2.4 2.2 2.0 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 DISTANCE UPSTREAM FROM MOUTH, IN MILES Figure 142. Winnebago River, beginning at mouth in Floyd County. Main-Channel Slopes of Selected Streams in Iowa for Estimation of Flood-Frequency Discharges By David A. Eash U.S. GEOLOGICAL SURVEY Water-Resources Investigations Report 03-4120 Prepared in cooperation with the IOWA DEPARTMENT OF TRANSPORTATION and the IOWA HIGHWAY RESEARCH BOARD (Project HR-456) Iowa City, Iowa 2003 U.S. DEPARTMENT OF THE INTERIOR GALE A. NORTON, Secretary U.S. GEOLOGICAL SURVEY Charles G. Groat, Director The use of firm, trade, and brand names in this report is for identification purposes only and does not constitute endorsement by the U.S. Geological Survey. For additional information write to: Copies of this report can be purchased from: District Chief U.S. Geological Survey U.S. Geological Survey, WRD Information Services Room 269 Federal Building Box 25286 P.O. Box 1230 Denver Federal Center 400 South Clinton Street Denver, CO 80225 Iowa City, IA 52244 CONTENTS Abstract.............................................................^ 1 Introduction.................................................................................................................^ 2 Purpose and Scope....................................................................................................................................................... 6 Acknowledgments....................................................................................................................................................... 6 Main-Channel-Slope Measurement Methods........................................................................................................................ 6 Manual Measurements................................................................................................................................................ 7 Geographic Information System Quantifications ........................................................................................................ 8 Comparison of Manual Measurements and Geographic Information System Quantifications .................................. 9 Main-Channel-Slope Curves.................................................................................................................................................. 10 Selection of Streams and Sites..................................................................................................................................... 11 Development of Curves ............................................................................................................................................... 11 Adjustment of Curves.................................................................................................................................................. 15 Presentation of Curves................................................................................................................................................. 17 Estimation of Flood-Frequency Discharges Using Main-Channel-Slope Curves................................................................